blob: 185fe058db11e64e270ba81d0c6ecddd7946d6d6 [file] [log] [blame]
Vlad Yasevich60c778b2008-01-11 09:57:09 -05001/* SCTP kernel implementation
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 * (C) Copyright IBM Corp. 2002, 2004
3 * Copyright (c) 2001 Nokia, Inc.
4 * Copyright (c) 2001 La Monte H.P. Yarroll
5 * Copyright (c) 2002-2003 Intel Corp.
6 *
Vlad Yasevich60c778b2008-01-11 09:57:09 -05007 * This file is part of the SCTP kernel implementation
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 *
9 * SCTP over IPv6.
10 *
Vlad Yasevich60c778b2008-01-11 09:57:09 -050011 * This SCTP implementation is free software;
Linus Torvalds1da177e2005-04-16 15:20:36 -070012 * you can redistribute it and/or modify it under the terms of
13 * the GNU General Public License as published by
14 * the Free Software Foundation; either version 2, or (at your option)
15 * any later version.
16 *
Vlad Yasevich60c778b2008-01-11 09:57:09 -050017 * This SCTP implementation is distributed in the hope that it
Linus Torvalds1da177e2005-04-16 15:20:36 -070018 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
19 * ************************
20 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
21 * See the GNU General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with GNU CC; see the file COPYING. If not, write to
25 * the Free Software Foundation, 59 Temple Place - Suite 330,
26 * Boston, MA 02111-1307, USA.
27 *
28 * Please send any bug reports or fixes you make to the
29 * email address(es):
30 * lksctp developers <lksctp-developers@lists.sourceforge.net>
31 *
32 * Or submit a bug report through the following website:
33 * http://www.sf.net/projects/lksctp
34 *
35 * Written or modified by:
36 * Le Yanqun <yanqun.le@nokia.com>
37 * Hui Huang <hui.huang@nokia.com>
38 * La Monte H.P. Yarroll <piggy@acm.org>
39 * Sridhar Samudrala <sri@us.ibm.com>
40 * Jon Grimm <jgrimm@us.ibm.com>
41 * Ardelle Fan <ardelle.fan@intel.com>
42 *
43 * Based on:
44 * linux/net/ipv6/tcp_ipv6.c
45 *
46 * Any bugs reported given to us we will try to fix... any fixes shared will
47 * be incorporated into the next SCTP release.
48 */
49
Joe Perches145ce502010-08-24 13:21:08 +000050#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
51
Linus Torvalds1da177e2005-04-16 15:20:36 -070052#include <linux/module.h>
53#include <linux/errno.h>
54#include <linux/types.h>
55#include <linux/socket.h>
56#include <linux/sockios.h>
57#include <linux/net.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070058#include <linux/in.h>
59#include <linux/in6.h>
60#include <linux/netdevice.h>
61#include <linux/init.h>
62#include <linux/ipsec.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090063#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070064
65#include <linux/ipv6.h>
66#include <linux/icmpv6.h>
67#include <linux/random.h>
68#include <linux/seq_file.h>
69
70#include <net/protocol.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070071#include <net/ndisc.h>
Arnaldo Carvalho de Meloc752f072005-08-09 20:08:28 -070072#include <net/ip.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070073#include <net/ipv6.h>
74#include <net/transp_v6.h>
75#include <net/addrconf.h>
76#include <net/ip6_route.h>
77#include <net/inet_common.h>
78#include <net/inet_ecn.h>
79#include <net/sctp/sctp.h>
80
81#include <asm/uaccess.h>
82
Vlad Yasevich29303542007-09-16 16:02:12 -070083/* Event handler for inet6 address addition/deletion events.
84 * The sctp_local_addr_list needs to be protocted by a spin lock since
85 * multiple notifiers (say IPv4 and IPv6) may be running at the same
86 * time and thus corrupt the list.
87 * The reader side is protected with RCU.
88 */
Adrian Bunk24123182006-12-20 16:08:22 -080089static int sctp_inet6addr_event(struct notifier_block *this, unsigned long ev,
90 void *ptr)
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -080091{
92 struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr;
Vlad Yasevich29303542007-09-16 16:02:12 -070093 struct sctp_sockaddr_entry *addr = NULL;
94 struct sctp_sockaddr_entry *temp;
Chidambar 'ilLogict' Zinnoury22626212008-03-11 18:05:02 -070095 int found = 0;
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -080096
97 switch (ev) {
98 case NETDEV_UP:
99 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
100 if (addr) {
101 addr->a.v6.sin6_family = AF_INET6;
102 addr->a.v6.sin6_port = 0;
Joe Perches4fe1d582009-01-22 13:49:44 -0800103 ipv6_addr_copy(&addr->a.v6.sin6_addr, &ifa->addr);
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800104 addr->a.v6.sin6_scope_id = ifa->idev->dev->ifindex;
Vlad Yasevich29303542007-09-16 16:02:12 -0700105 addr->valid = 1;
106 spin_lock_bh(&sctp_local_addr_lock);
107 list_add_tail_rcu(&addr->list, &sctp_local_addr_list);
108 spin_unlock_bh(&sctp_local_addr_lock);
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800109 }
110 break;
111 case NETDEV_DOWN:
Vlad Yasevich29303542007-09-16 16:02:12 -0700112 spin_lock_bh(&sctp_local_addr_lock);
113 list_for_each_entry_safe(addr, temp,
114 &sctp_local_addr_list, list) {
Pavel Emelyanova40a7d12008-04-12 18:40:38 -0700115 if (addr->a.sa.sa_family == AF_INET6 &&
116 ipv6_addr_equal(&addr->a.v6.sin6_addr,
117 &ifa->addr)) {
Chidambar 'ilLogict' Zinnoury22626212008-03-11 18:05:02 -0700118 found = 1;
Vlad Yasevich29303542007-09-16 16:02:12 -0700119 addr->valid = 0;
120 list_del_rcu(&addr->list);
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800121 break;
122 }
123 }
Vlad Yasevich29303542007-09-16 16:02:12 -0700124 spin_unlock_bh(&sctp_local_addr_lock);
Chidambar 'ilLogict' Zinnoury22626212008-03-11 18:05:02 -0700125 if (found)
Lai Jiangshan1231f0b2011-03-15 18:05:02 +0800126 kfree_rcu(addr, rcu);
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800127 break;
128 }
129
130 return NOTIFY_DONE;
131}
132
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133static struct notifier_block sctp_inet6addr_notifier = {
Sridhar Samudrala29c7cf92006-12-13 16:26:26 -0800134 .notifier_call = sctp_inet6addr_event,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135};
136
137/* ICMP error handler. */
138SCTP_STATIC void sctp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
Brian Haleyd5fdd6b2009-06-23 04:31:07 -0700139 u8 type, u8 code, int offset, __be32 info)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140{
141 struct inet6_dev *idev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142 struct sock *sk;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143 struct sctp_association *asoc;
144 struct sctp_transport *transport;
145 struct ipv6_pinfo *np;
Arnaldo Carvalho de Melo2e07fa92007-04-10 21:22:35 -0700146 sk_buff_data_t saveip, savesctp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147 int err;
148
149 idev = in6_dev_get(skb->dev);
150
151 /* Fix up skb to look at the embedded net header. */
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700152 saveip = skb->network_header;
153 savesctp = skb->transport_header;
Arnaldo Carvalho de Melo1ced98e2007-03-10 19:57:15 -0300154 skb_reset_network_header(skb);
Arnaldo Carvalho de Meloa27ef742007-03-13 17:17:10 -0300155 skb_set_transport_header(skb, offset);
156 sk = sctp_err_lookup(AF_INET6, skb, sctp_hdr(skb), &asoc, &transport);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157 /* Put back, the original pointers. */
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700158 skb->network_header = saveip;
159 skb->transport_header = savesctp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160 if (!sk) {
Denis V. Luneve41b5362008-10-08 10:33:26 -0700161 ICMP6_INC_STATS_BH(dev_net(skb->dev), idev, ICMP6_MIB_INERRORS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162 goto out;
163 }
164
165 /* Warning: The sock lock is held. Remember to call
166 * sctp_err_finish!
167 */
168
169 switch (type) {
170 case ICMPV6_PKT_TOOBIG:
171 sctp_icmp_frag_needed(sk, asoc, transport, ntohl(info));
172 goto out_unlock;
173 case ICMPV6_PARAMPROB:
174 if (ICMPV6_UNK_NEXTHDR == code) {
Sridhar Samudralad1ad1ff2005-07-18 13:44:10 -0700175 sctp_icmp_proto_unreachable(sk, asoc, transport);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176 goto out_unlock;
177 }
178 break;
179 default:
180 break;
181 }
182
183 np = inet6_sk(sk);
184 icmpv6_err_convert(type, code, &err);
185 if (!sock_owned_by_user(sk) && np->recverr) {
186 sk->sk_err = err;
187 sk->sk_error_report(sk);
188 } else { /* Only an error on timeout */
189 sk->sk_err_soft = err;
190 }
191
192out_unlock:
Sridhar Samudralad1ad1ff2005-07-18 13:44:10 -0700193 sctp_err_finish(sk, asoc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194out:
195 if (likely(idev != NULL))
196 in6_dev_put(idev);
197}
198
199/* Based on tcp_v6_xmit() in tcp_ipv6.c. */
Herbert Xuf8803742008-08-03 21:15:08 -0700200static int sctp_v6_xmit(struct sk_buff *skb, struct sctp_transport *transport)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201{
202 struct sock *sk = skb->sk;
203 struct ipv6_pinfo *np = inet6_sk(sk);
David S. Miller4c9483b2011-03-12 16:22:43 -0500204 struct flowi6 fl6;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205
David S. Miller4c9483b2011-03-12 16:22:43 -0500206 memset(&fl6, 0, sizeof(fl6));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207
David S. Miller4c9483b2011-03-12 16:22:43 -0500208 fl6.flowi6_proto = sk->sk_protocol;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209
210 /* Fill in the dest address from the route entry passed with the skb
211 * and the source address from the transport.
212 */
David S. Miller4c9483b2011-03-12 16:22:43 -0500213 ipv6_addr_copy(&fl6.daddr, &transport->ipaddr.v6.sin6_addr);
214 ipv6_addr_copy(&fl6.saddr, &transport->saddr.v6.sin6_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215
David S. Miller4c9483b2011-03-12 16:22:43 -0500216 fl6.flowlabel = np->flow_label;
217 IP6_ECN_flow_xmit(sk, fl6.flowlabel);
218 if (ipv6_addr_type(&fl6.saddr) & IPV6_ADDR_LINKLOCAL)
219 fl6.flowi6_oif = transport->saddr.v6.sin6_scope_id;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220 else
David S. Miller4c9483b2011-03-12 16:22:43 -0500221 fl6.flowi6_oif = sk->sk_bound_dev_if;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222
223 if (np->opt && np->opt->srcrt) {
224 struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
David S. Miller4c9483b2011-03-12 16:22:43 -0500225 ipv6_addr_copy(&fl6.daddr, rt0->addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 }
227
Harvey Harrison5b095d9892008-10-29 12:52:50 -0700228 SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, src:%pI6 dst:%pI6\n",
Harvey Harrison0dc47872008-03-05 20:47:47 -0800229 __func__, skb, skb->len,
David S. Miller4c9483b2011-03-12 16:22:43 -0500230 &fl6.saddr, &fl6.daddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231
232 SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS);
233
Herbert Xuf8803742008-08-03 21:15:08 -0700234 if (!(transport->param_flags & SPP_PMTUD_ENABLE))
235 skb->local_df = 1;
236
David S. Miller4c9483b2011-03-12 16:22:43 -0500237 return ip6_xmit(sk, skb, &fl6, np->opt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238}
239
240/* Returns the dst cache entry for the given source and destination ip
241 * addresses.
242 */
243static struct dst_entry *sctp_v6_get_dst(struct sctp_association *asoc,
244 union sctp_addr *daddr,
245 union sctp_addr *saddr)
246{
247 struct dst_entry *dst;
David S. Miller4c9483b2011-03-12 16:22:43 -0500248 struct flowi6 fl6;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249
David S. Miller4c9483b2011-03-12 16:22:43 -0500250 memset(&fl6, 0, sizeof(fl6));
251 ipv6_addr_copy(&fl6.daddr, &daddr->v6.sin6_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252 if (ipv6_addr_type(&daddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
David S. Miller4c9483b2011-03-12 16:22:43 -0500253 fl6.flowi6_oif = daddr->v6.sin6_scope_id;
YOSHIFUJI Hideakid808ad92007-02-09 23:25:18 +0900254
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255
David S. Miller4c9483b2011-03-12 16:22:43 -0500256 SCTP_DEBUG_PRINTK("%s: DST=%pI6 ", __func__, &fl6.daddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257
258 if (saddr) {
David S. Miller4c9483b2011-03-12 16:22:43 -0500259 ipv6_addr_copy(&fl6.saddr, &saddr->v6.sin6_addr);
260 SCTP_DEBUG_PRINTK("SRC=%pI6 - ", &fl6.saddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261 }
262
David S. Miller4c9483b2011-03-12 16:22:43 -0500263 dst = ip6_route_output(&init_net, NULL, &fl6);
Ville Nuorvala42513202006-10-16 22:10:05 -0700264 if (!dst->error) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265 struct rt6_info *rt;
266 rt = (struct rt6_info *)dst;
Harvey Harrison5b095d9892008-10-29 12:52:50 -0700267 SCTP_DEBUG_PRINTK("rt6_dst:%pI6 rt6_src:%pI6\n",
Harvey Harrisonfdb46ee2008-10-28 16:10:17 -0700268 &rt->rt6i_dst.addr, &rt->rt6i_src.addr);
Ville Nuorvala42513202006-10-16 22:10:05 -0700269 return dst;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270 }
Ville Nuorvala42513202006-10-16 22:10:05 -0700271 SCTP_DEBUG_PRINTK("NO ROUTE\n");
272 dst_release(dst);
273 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274}
275
276/* Returns the number of consecutive initial bits that match in the 2 ipv6
277 * addresses.
278 */
279static inline int sctp_v6_addr_match_len(union sctp_addr *s1,
280 union sctp_addr *s2)
281{
YOSHIFUJI Hideaki / 吉藤英明de7737e2010-03-26 08:34:30 +0000282 return ipv6_addr_diff(&s1->v6.sin6_addr, &s2->v6.sin6_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283}
284
285/* Fills in the source address(saddr) based on the destination address(daddr)
286 * and asoc's bind address list.
287 */
YOSHIFUJI Hideakie5117102008-05-29 19:55:05 +0900288static void sctp_v6_get_saddr(struct sctp_sock *sk,
289 struct sctp_association *asoc,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290 struct dst_entry *dst,
291 union sctp_addr *daddr,
292 union sctp_addr *saddr)
293{
294 struct sctp_bind_addr *bp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295 struct sctp_sockaddr_entry *laddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296 sctp_scope_t scope;
297 union sctp_addr *baddr = NULL;
298 __u8 matchlen = 0;
299 __u8 bmatchlen;
300
Harvey Harrison5b095d9892008-10-29 12:52:50 -0700301 SCTP_DEBUG_PRINTK("%s: asoc:%p dst:%p daddr:%pI6 ",
Harvey Harrisonfdb46ee2008-10-28 16:10:17 -0700302 __func__, asoc, dst, &daddr->v6.sin6_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303
304 if (!asoc) {
Brian Haley191cd582008-08-14 15:33:21 -0700305 ipv6_dev_get_saddr(sock_net(sctp_opt2sk(sk)),
306 dst ? ip6_dst_idev(dst)->dev : NULL,
YOSHIFUJI Hideaki7cbca672008-03-25 09:37:42 +0900307 &daddr->v6.sin6_addr,
YOSHIFUJI Hideakie5117102008-05-29 19:55:05 +0900308 inet6_sk(&sk->inet.sk)->srcprefs,
YOSHIFUJI Hideaki7cbca672008-03-25 09:37:42 +0900309 &saddr->v6.sin6_addr);
Harvey Harrison5b095d9892008-10-29 12:52:50 -0700310 SCTP_DEBUG_PRINTK("saddr from ipv6_get_saddr: %pI6\n",
Harvey Harrisonfdb46ee2008-10-28 16:10:17 -0700311 &saddr->v6.sin6_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312 return;
313 }
314
315 scope = sctp_scope(daddr);
316
317 bp = &asoc->base.bind_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318
319 /* Go through the bind address list and find the best source address
320 * that matches the scope of the destination address.
321 */
Vlad Yasevich559cf712007-09-16 16:03:28 -0700322 rcu_read_lock();
323 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
324 if (!laddr->valid)
325 continue;
Vlad Yasevichf57d96b2007-12-20 14:12:24 -0800326 if ((laddr->state == SCTP_ADDR_SRC) &&
Al Viro6244be42006-11-20 17:21:44 -0800327 (laddr->a.sa.sa_family == AF_INET6) &&
328 (scope <= sctp_scope(&laddr->a))) {
Al Virod3f7a542006-11-20 17:12:41 -0800329 bmatchlen = sctp_v6_addr_match_len(daddr, &laddr->a);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330 if (!baddr || (matchlen < bmatchlen)) {
Al Virod3f7a542006-11-20 17:12:41 -0800331 baddr = &laddr->a;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332 matchlen = bmatchlen;
333 }
334 }
335 }
336
337 if (baddr) {
338 memcpy(saddr, baddr, sizeof(union sctp_addr));
Harvey Harrison5b095d9892008-10-29 12:52:50 -0700339 SCTP_DEBUG_PRINTK("saddr: %pI6\n", &saddr->v6.sin6_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340 } else {
Joe Perches145ce502010-08-24 13:21:08 +0000341 pr_err("%s: asoc:%p Could not find a valid source "
Harvey Harrison5b095d9892008-10-29 12:52:50 -0700342 "address for the dest:%pI6\n",
Harvey Harrisonfdb46ee2008-10-28 16:10:17 -0700343 __func__, asoc, &daddr->v6.sin6_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344 }
345
Vlad Yasevich559cf712007-09-16 16:03:28 -0700346 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347}
348
349/* Make a copy of all potential local addresses. */
350static void sctp_v6_copy_addrlist(struct list_head *addrlist,
351 struct net_device *dev)
352{
353 struct inet6_dev *in6_dev;
354 struct inet6_ifaddr *ifp;
355 struct sctp_sockaddr_entry *addr;
356
YOSHIFUJI Hideaki8814c4b2006-09-22 14:44:24 -0700357 rcu_read_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358 if ((in6_dev = __in6_dev_get(dev)) == NULL) {
YOSHIFUJI Hideaki8814c4b2006-09-22 14:44:24 -0700359 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360 return;
361 }
362
Jarek Poplawskie2eb8d42007-03-08 14:43:41 -0800363 read_lock_bh(&in6_dev->lock);
stephen hemminger502a2ff2010-03-17 20:31:13 +0000364 list_for_each_entry(ifp, &in6_dev->addr_list, if_list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365 /* Add the address to the local list. */
366 addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC);
367 if (addr) {
Al Viro2a6fd782006-11-20 17:04:42 -0800368 addr->a.v6.sin6_family = AF_INET6;
369 addr->a.v6.sin6_port = 0;
Brian Haley486f50c2010-04-03 15:10:21 -0700370 ipv6_addr_copy(&addr->a.v6.sin6_addr, &ifp->addr);
Al Viro2a6fd782006-11-20 17:04:42 -0800371 addr->a.v6.sin6_scope_id = dev->ifindex;
Vlad Yasevich29303542007-09-16 16:02:12 -0700372 addr->valid = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373 INIT_LIST_HEAD(&addr->list);
374 list_add_tail(&addr->list, addrlist);
375 }
376 }
377
Jarek Poplawskie2eb8d42007-03-08 14:43:41 -0800378 read_unlock_bh(&in6_dev->lock);
YOSHIFUJI Hideaki8814c4b2006-09-22 14:44:24 -0700379 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380}
381
382/* Initialize a sockaddr_storage from in incoming skb. */
383static void sctp_v6_from_skb(union sctp_addr *addr,struct sk_buff *skb,
384 int is_saddr)
385{
386 void *from;
Al Virod55c41b2006-11-20 17:09:40 -0800387 __be16 *port;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388 struct sctphdr *sh;
389
390 port = &addr->v6.sin6_port;
391 addr->v6.sin6_family = AF_INET6;
392 addr->v6.sin6_flowinfo = 0; /* FIXME */
393 addr->v6.sin6_scope_id = ((struct inet6_skb_parm *)skb->cb)->iif;
394
Arnaldo Carvalho de Melo2c0fd382007-03-13 13:59:32 -0300395 sh = sctp_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396 if (is_saddr) {
Al Virod55c41b2006-11-20 17:09:40 -0800397 *port = sh->source;
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700398 from = &ipv6_hdr(skb)->saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399 } else {
Al Virod55c41b2006-11-20 17:09:40 -0800400 *port = sh->dest;
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700401 from = &ipv6_hdr(skb)->daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402 }
403 ipv6_addr_copy(&addr->v6.sin6_addr, from);
404}
405
406/* Initialize an sctp_addr from a socket. */
407static void sctp_v6_from_sk(union sctp_addr *addr, struct sock *sk)
408{
409 addr->v6.sin6_family = AF_INET6;
Al Viro7dcdbd92006-11-20 17:24:21 -0800410 addr->v6.sin6_port = 0;
Brian Haley486f50c2010-04-03 15:10:21 -0700411 ipv6_addr_copy(&addr->v6.sin6_addr, &inet6_sk(sk)->rcv_saddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412}
413
414/* Initialize sk->sk_rcv_saddr from sctp_addr. */
415static void sctp_v6_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
416{
417 if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) {
418 inet6_sk(sk)->rcv_saddr.s6_addr32[0] = 0;
419 inet6_sk(sk)->rcv_saddr.s6_addr32[1] = 0;
420 inet6_sk(sk)->rcv_saddr.s6_addr32[2] = htonl(0x0000ffff);
421 inet6_sk(sk)->rcv_saddr.s6_addr32[3] =
422 addr->v4.sin_addr.s_addr;
423 } else {
Brian Haley486f50c2010-04-03 15:10:21 -0700424 ipv6_addr_copy(&inet6_sk(sk)->rcv_saddr, &addr->v6.sin6_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425 }
426}
427
428/* Initialize sk->sk_daddr from sctp_addr. */
429static void sctp_v6_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
430{
431 if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) {
432 inet6_sk(sk)->daddr.s6_addr32[0] = 0;
433 inet6_sk(sk)->daddr.s6_addr32[1] = 0;
434 inet6_sk(sk)->daddr.s6_addr32[2] = htonl(0x0000ffff);
435 inet6_sk(sk)->daddr.s6_addr32[3] = addr->v4.sin_addr.s_addr;
436 } else {
Brian Haley486f50c2010-04-03 15:10:21 -0700437 ipv6_addr_copy(&inet6_sk(sk)->daddr, &addr->v6.sin6_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438 }
439}
440
441/* Initialize a sctp_addr from an address parameter. */
442static void sctp_v6_from_addr_param(union sctp_addr *addr,
443 union sctp_addr_param *param,
Al Virodd86d132006-11-20 17:11:13 -0800444 __be16 port, int iif)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445{
446 addr->v6.sin6_family = AF_INET6;
447 addr->v6.sin6_port = port;
448 addr->v6.sin6_flowinfo = 0; /* BUG */
449 ipv6_addr_copy(&addr->v6.sin6_addr, &param->v6.addr);
450 addr->v6.sin6_scope_id = iif;
451}
452
453/* Initialize an address parameter from a sctp_addr and return the length
454 * of the address parameter.
455 */
456static int sctp_v6_to_addr_param(const union sctp_addr *addr,
457 union sctp_addr_param *param)
458{
459 int length = sizeof(sctp_ipv6addr_param_t);
460
461 param->v6.param_hdr.type = SCTP_PARAM_IPV6_ADDRESS;
Al Virodbc16db2006-11-20 17:01:42 -0800462 param->v6.param_hdr.length = htons(length);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463 ipv6_addr_copy(&param->v6.addr, &addr->v6.sin6_addr);
464
465 return length;
466}
467
468/* Initialize a sctp_addr from a dst_entry. */
469static void sctp_v6_dst_saddr(union sctp_addr *addr, struct dst_entry *dst,
Al Viro854d43a2006-11-20 17:06:24 -0800470 __be16 port)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471{
472 struct rt6_info *rt = (struct rt6_info *)dst;
473 addr->sa.sa_family = AF_INET6;
474 addr->v6.sin6_port = port;
475 ipv6_addr_copy(&addr->v6.sin6_addr, &rt->rt6i_src.addr);
476}
477
478/* Compare addresses exactly.
479 * v4-mapped-v6 is also in consideration.
480 */
481static int sctp_v6_cmp_addr(const union sctp_addr *addr1,
482 const union sctp_addr *addr2)
483{
484 if (addr1->sa.sa_family != addr2->sa.sa_family) {
485 if (addr1->sa.sa_family == AF_INET &&
486 addr2->sa.sa_family == AF_INET6 &&
Brian Haleye773e4f2007-08-24 23:16:08 -0700487 ipv6_addr_v4mapped(&addr2->v6.sin6_addr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488 if (addr2->v6.sin6_port == addr1->v4.sin_port &&
489 addr2->v6.sin6_addr.s6_addr32[3] ==
490 addr1->v4.sin_addr.s_addr)
491 return 1;
492 }
493 if (addr2->sa.sa_family == AF_INET &&
494 addr1->sa.sa_family == AF_INET6 &&
Brian Haleye773e4f2007-08-24 23:16:08 -0700495 ipv6_addr_v4mapped(&addr1->v6.sin6_addr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496 if (addr1->v6.sin6_port == addr2->v4.sin_port &&
497 addr1->v6.sin6_addr.s6_addr32[3] ==
498 addr2->v4.sin_addr.s_addr)
499 return 1;
500 }
501 return 0;
502 }
503 if (!ipv6_addr_equal(&addr1->v6.sin6_addr, &addr2->v6.sin6_addr))
504 return 0;
505 /* If this is a linklocal address, compare the scope_id. */
506 if (ipv6_addr_type(&addr1->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) {
507 if (addr1->v6.sin6_scope_id && addr2->v6.sin6_scope_id &&
508 (addr1->v6.sin6_scope_id != addr2->v6.sin6_scope_id)) {
509 return 0;
510 }
511 }
512
513 return 1;
514}
515
516/* Initialize addr struct to INADDR_ANY. */
Al Viro6fbfa9f2006-11-20 17:24:53 -0800517static void sctp_v6_inaddr_any(union sctp_addr *addr, __be16 port)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518{
519 memset(addr, 0x00, sizeof(union sctp_addr));
520 addr->v6.sin6_family = AF_INET6;
521 addr->v6.sin6_port = port;
522}
523
524/* Is this a wildcard address? */
525static int sctp_v6_is_any(const union sctp_addr *addr)
526{
Brian Haleyb9b9e102005-04-28 11:59:16 -0700527 return ipv6_addr_any(&addr->v6.sin6_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528}
529
530/* Should this be available for binding? */
531static int sctp_v6_available(union sctp_addr *addr, struct sctp_sock *sp)
532{
533 int type;
534 struct in6_addr *in6 = (struct in6_addr *)&addr->v6.sin6_addr;
535
536 type = ipv6_addr_type(in6);
537 if (IPV6_ADDR_ANY == type)
538 return 1;
539 if (type == IPV6_ADDR_MAPPED) {
540 if (sp && !sp->v4mapped)
541 return 0;
542 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
543 return 0;
544 sctp_v6_map_v4(addr);
545 return sctp_get_af_specific(AF_INET)->available(addr, sp);
546 }
547 if (!(type & IPV6_ADDR_UNICAST))
548 return 0;
549
Daniel Lezcanobfeade02008-01-10 22:43:18 -0800550 return ipv6_chk_addr(&init_net, in6, NULL, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551}
552
553/* This function checks if the address is a valid address to be used for
554 * SCTP.
555 *
556 * Output:
557 * Return 0 - If the address is a non-unicast or an illegal address.
558 * Return 1 - If the address is a unicast.
559 */
Vlad Yasevich5636bef2006-06-17 22:55:35 -0700560static int sctp_v6_addr_valid(union sctp_addr *addr,
561 struct sctp_sock *sp,
562 const struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563{
564 int ret = ipv6_addr_type(&addr->v6.sin6_addr);
565
566 /* Support v4-mapped-v6 address. */
567 if (ret == IPV6_ADDR_MAPPED) {
568 /* Note: This routine is used in input, so v4-mapped-v6
569 * are disallowed here when there is no sctp_sock.
570 */
571 if (!sp || !sp->v4mapped)
572 return 0;
573 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
574 return 0;
575 sctp_v6_map_v4(addr);
Vlad Yasevich5636bef2006-06-17 22:55:35 -0700576 return sctp_get_af_specific(AF_INET)->addr_valid(addr, sp, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577 }
578
579 /* Is this a non-unicast address */
580 if (!(ret & IPV6_ADDR_UNICAST))
581 return 0;
582
583 return 1;
584}
585
586/* What is the scope of 'addr'? */
587static sctp_scope_t sctp_v6_scope(union sctp_addr *addr)
588{
589 int v6scope;
590 sctp_scope_t retval;
591
592 /* The IPv6 scope is really a set of bit fields.
593 * See IFA_* in <net/if_inet6.h>. Map to a generic SCTP scope.
594 */
595
596 v6scope = ipv6_addr_scope(&addr->v6.sin6_addr);
597 switch (v6scope) {
598 case IFA_HOST:
599 retval = SCTP_SCOPE_LOOPBACK;
600 break;
601 case IFA_LINK:
602 retval = SCTP_SCOPE_LINK;
603 break;
604 case IFA_SITE:
605 retval = SCTP_SCOPE_PRIVATE;
606 break;
607 default:
608 retval = SCTP_SCOPE_GLOBAL;
609 break;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -0700610 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611
612 return retval;
613}
614
615/* Create and initialize a new sk for the socket to be returned by accept(). */
616static struct sock *sctp_v6_create_accept_sk(struct sock *sk,
617 struct sctp_association *asoc)
618{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619 struct sock *newsk;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
621 struct sctp6_sock *newsctp6sk;
622
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900623 newsk = sk_alloc(sock_net(sk), PF_INET6, GFP_KERNEL, sk->sk_prot);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624 if (!newsk)
625 goto out;
626
627 sock_init_data(NULL, newsk);
628
Vlad Yasevich914e1c82009-02-13 08:33:44 +0000629 sctp_copy_sock(newsk, sk, asoc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630 sock_reset_flag(sk, SOCK_ZAPPED);
631
632 newsctp6sk = (struct sctp6_sock *)newsk;
633 inet_sk(newsk)->pinet6 = &newsctp6sk->inet6;
634
Dave Johnsonb225b882007-07-25 19:49:29 -0400635 sctp_sk(newsk)->v4mapped = sctp_sk(sk)->v4mapped;
636
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637 newnp = inet6_sk(newsk);
638
639 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
640
641 /* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname()
642 * and getpeername().
643 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644 sctp_v6_to_sk_daddr(&asoc->peer.primary_addr, newsk);
645
Arnaldo Carvalho de Meloe6848972005-08-09 19:45:38 -0700646 sk_refcnt_debug_inc(newsk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647
648 if (newsk->sk_prot->init(newsk)) {
649 sk_common_release(newsk);
650 newsk = NULL;
651 }
652
653out:
654 return newsk;
655}
656
657/* Map v4 address to mapped v6 address */
658static void sctp_v6_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr)
659{
660 if (sp->v4mapped && AF_INET == addr->sa.sa_family)
661 sctp_v4_map_v6(addr);
662}
663
664/* Where did this skb come from? */
665static int sctp_v6_skb_iif(const struct sk_buff *skb)
666{
667 struct inet6_skb_parm *opt = (struct inet6_skb_parm *) skb->cb;
668 return opt->iif;
669}
670
671/* Was this packet marked by Explicit Congestion Notification? */
672static int sctp_v6_is_ce(const struct sk_buff *skb)
673{
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700674 return *((__u32 *)(ipv6_hdr(skb))) & htonl(1 << 20);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700675}
676
677/* Dump the v6 addr to the seq file. */
678static void sctp_v6_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
679{
Harvey Harrison5b095d9892008-10-29 12:52:50 -0700680 seq_printf(seq, "%pI6 ", &addr->v6.sin6_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681}
682
Vlad Yasevichb9031d92008-06-04 12:40:15 -0700683static void sctp_v6_ecn_capable(struct sock *sk)
684{
685 inet6_sk(sk)->tclass |= INET_ECN_ECT_0;
686}
687
Linus Torvalds1da177e2005-04-16 15:20:36 -0700688/* Initialize a PF_INET6 socket msg_name. */
689static void sctp_inet6_msgname(char *msgname, int *addr_len)
690{
691 struct sockaddr_in6 *sin6;
692
693 sin6 = (struct sockaddr_in6 *)msgname;
694 sin6->sin6_family = AF_INET6;
695 sin6->sin6_flowinfo = 0;
696 sin6->sin6_scope_id = 0; /*FIXME */
697 *addr_len = sizeof(struct sockaddr_in6);
698}
699
700/* Initialize a PF_INET msgname from a ulpevent. */
701static void sctp_inet6_event_msgname(struct sctp_ulpevent *event,
702 char *msgname, int *addrlen)
703{
704 struct sockaddr_in6 *sin6, *sin6from;
705
706 if (msgname) {
707 union sctp_addr *addr;
708 struct sctp_association *asoc;
709
710 asoc = event->asoc;
711 sctp_inet6_msgname(msgname, addrlen);
712 sin6 = (struct sockaddr_in6 *)msgname;
713 sin6->sin6_port = htons(asoc->peer.port);
714 addr = &asoc->peer.primary_addr;
715
716 /* Note: If we go to a common v6 format, this code
717 * will change.
718 */
719
720 /* Map ipv4 address into v4-mapped-on-v6 address. */
721 if (sctp_sk(asoc->base.sk)->v4mapped &&
722 AF_INET == addr->sa.sa_family) {
723 sctp_v4_map_v6((union sctp_addr *)sin6);
724 sin6->sin6_addr.s6_addr32[3] =
725 addr->v4.sin_addr.s_addr;
726 return;
727 }
728
729 sin6from = &asoc->peer.primary_addr.v6;
730 ipv6_addr_copy(&sin6->sin6_addr, &sin6from->sin6_addr);
731 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
732 sin6->sin6_scope_id = sin6from->sin6_scope_id;
733 }
734}
735
736/* Initialize a msg_name from an inbound skb. */
737static void sctp_inet6_skb_msgname(struct sk_buff *skb, char *msgname,
738 int *addr_len)
739{
740 struct sctphdr *sh;
741 struct sockaddr_in6 *sin6;
742
743 if (msgname) {
744 sctp_inet6_msgname(msgname, addr_len);
745 sin6 = (struct sockaddr_in6 *)msgname;
Arnaldo Carvalho de Melo2c0fd382007-03-13 13:59:32 -0300746 sh = sctp_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747 sin6->sin6_port = sh->source;
748
749 /* Map ipv4 address into v4-mapped-on-v6 address. */
750 if (sctp_sk(skb->sk)->v4mapped &&
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700751 ip_hdr(skb)->version == 4) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752 sctp_v4_map_v6((union sctp_addr *)sin6);
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700753 sin6->sin6_addr.s6_addr32[3] = ip_hdr(skb)->saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700754 return;
755 }
756
757 /* Otherwise, just copy the v6 address. */
Arnaldo Carvalho de Melo0660e032007-04-25 17:54:47 -0700758 ipv6_addr_copy(&sin6->sin6_addr, &ipv6_hdr(skb)->saddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700759 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) {
760 struct sctp_ulpevent *ev = sctp_skb2event(skb);
761 sin6->sin6_scope_id = ev->iif;
762 }
763 }
764}
765
766/* Do we support this AF? */
767static int sctp_inet6_af_supported(sa_family_t family, struct sctp_sock *sp)
768{
769 switch (family) {
770 case AF_INET6:
771 return 1;
772 /* v4-mapped-v6 addresses */
773 case AF_INET:
Vlad Yasevich7dab83d2008-07-18 23:05:40 -0700774 if (!__ipv6_only_sock(sctp_opt2sk(sp)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700775 return 1;
776 default:
777 return 0;
778 }
779}
780
781/* Address matching with wildcards allowed. This extra level
782 * of indirection lets us choose whether a PF_INET6 should
783 * disallow any v4 addresses if we so choose.
784 */
785static int sctp_inet6_cmp_addr(const union sctp_addr *addr1,
786 const union sctp_addr *addr2,
787 struct sctp_sock *opt)
788{
789 struct sctp_af *af1, *af2;
Vlad Yasevich52cae8f2008-08-18 10:34:34 -0400790 struct sock *sk = sctp_opt2sk(opt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700791
792 af1 = sctp_get_af_specific(addr1->sa.sa_family);
793 af2 = sctp_get_af_specific(addr2->sa.sa_family);
794
795 if (!af1 || !af2)
796 return 0;
Vlad Yasevich7dab83d2008-07-18 23:05:40 -0700797
798 /* If the socket is IPv6 only, v4 addrs will not match */
Vlad Yasevich52cae8f2008-08-18 10:34:34 -0400799 if (__ipv6_only_sock(sk) && af1 != af2)
Vlad Yasevich7dab83d2008-07-18 23:05:40 -0700800 return 0;
801
Linus Torvalds1da177e2005-04-16 15:20:36 -0700802 /* Today, wildcard AF_INET/AF_INET6. */
Vlad Yasevich52cae8f2008-08-18 10:34:34 -0400803 if (sctp_is_any(sk, addr1) || sctp_is_any(sk, addr2))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700804 return 1;
805
806 if (addr1->sa.sa_family != addr2->sa.sa_family)
807 return 0;
808
809 return af1->cmp_addr(addr1, addr2);
810}
811
812/* Verify that the provided sockaddr looks bindable. Common verification,
813 * has already been taken care of.
814 */
815static int sctp_inet6_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
816{
817 struct sctp_af *af;
818
819 /* ASSERT: address family has already been verified. */
820 if (addr->sa.sa_family != AF_INET6)
821 af = sctp_get_af_specific(addr->sa.sa_family);
822 else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700823 int type = ipv6_addr_type(&addr->v6.sin6_addr);
Sridhar Samudrala6a6ddb22005-06-13 15:13:05 -0700824 struct net_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700825
Sridhar Samudrala6a6ddb22005-06-13 15:13:05 -0700826 if (type & IPV6_ADDR_LINKLOCAL) {
827 if (!addr->v6.sin6_scope_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828 return 0;
Eric Dumazet40c9c312009-11-05 20:56:46 -0800829 rcu_read_lock();
830 dev = dev_get_by_index_rcu(&init_net,
831 addr->v6.sin6_scope_id);
832 if (!dev ||
833 !ipv6_chk_addr(&init_net, &addr->v6.sin6_addr,
Daniel Lezcanobfeade02008-01-10 22:43:18 -0800834 dev, 0)) {
Eric Dumazet40c9c312009-11-05 20:56:46 -0800835 rcu_read_unlock();
Vlad Yasevich1669d852007-07-03 14:29:23 -0400836 return 0;
837 }
Eric Dumazet40c9c312009-11-05 20:56:46 -0800838 rcu_read_unlock();
Vlad Yasevich7dab83d2008-07-18 23:05:40 -0700839 } else if (type == IPV6_ADDR_MAPPED) {
840 if (!opt->v4mapped)
841 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842 }
Vlad Yasevich7dab83d2008-07-18 23:05:40 -0700843
Linus Torvalds1da177e2005-04-16 15:20:36 -0700844 af = opt->pf->af;
845 }
846 return af->available(addr, opt);
847}
848
Sridhar Samudrala6a6ddb22005-06-13 15:13:05 -0700849/* Verify that the provided sockaddr looks sendable. Common verification,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700850 * has already been taken care of.
851 */
852static int sctp_inet6_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
853{
854 struct sctp_af *af = NULL;
855
856 /* ASSERT: address family has already been verified. */
857 if (addr->sa.sa_family != AF_INET6)
858 af = sctp_get_af_specific(addr->sa.sa_family);
859 else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700860 int type = ipv6_addr_type(&addr->v6.sin6_addr);
Sridhar Samudrala6a6ddb22005-06-13 15:13:05 -0700861 struct net_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700862
Sridhar Samudrala6a6ddb22005-06-13 15:13:05 -0700863 if (type & IPV6_ADDR_LINKLOCAL) {
864 if (!addr->v6.sin6_scope_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700865 return 0;
Eric Dumazet40c9c312009-11-05 20:56:46 -0800866 rcu_read_lock();
867 dev = dev_get_by_index_rcu(&init_net,
868 addr->v6.sin6_scope_id);
869 rcu_read_unlock();
Sridhar Samudrala6a6ddb22005-06-13 15:13:05 -0700870 if (!dev)
871 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700872 }
873 af = opt->pf->af;
874 }
875
876 return af != NULL;
877}
878
879/* Fill in Supported Address Type information for INIT and INIT-ACK
880 * chunks. Note: In the future, we may want to look at sock options
881 * to determine whether a PF_INET6 socket really wants to have IPV4
882 * addresses.
883 * Returns number of addresses supported.
884 */
885static int sctp_inet6_supported_addrs(const struct sctp_sock *opt,
Al Viro3dbe8652006-11-20 17:25:49 -0800886 __be16 *types)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887{
Vlad Yasevich7dab83d2008-07-18 23:05:40 -0700888 types[0] = SCTP_PARAM_IPV6_ADDRESS;
889 if (!opt || !ipv6_only_sock(sctp_opt2sk(opt))) {
890 types[1] = SCTP_PARAM_IPV4_ADDRESS;
891 return 2;
892 }
893 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700894}
895
Eric Dumazet90ddc4f2005-12-22 12:49:22 -0800896static const struct proto_ops inet6_seqpacket_ops = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800897 .family = PF_INET6,
898 .owner = THIS_MODULE,
899 .release = inet6_release,
900 .bind = inet6_bind,
901 .connect = inet_dgram_connect,
902 .socketpair = sock_no_socketpair,
903 .accept = inet_accept,
904 .getname = inet6_getname,
905 .poll = sctp_poll,
906 .ioctl = inet6_ioctl,
907 .listen = sctp_inet_listen,
908 .shutdown = inet_shutdown,
909 .setsockopt = sock_common_setsockopt,
910 .getsockopt = sock_common_getsockopt,
911 .sendmsg = inet_sendmsg,
912 .recvmsg = sock_common_recvmsg,
913 .mmap = sock_no_mmap,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800914#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800915 .compat_setsockopt = compat_sock_common_setsockopt,
916 .compat_getsockopt = compat_sock_common_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800917#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700918};
919
920static struct inet_protosw sctpv6_seqpacket_protosw = {
921 .type = SOCK_SEQPACKET,
922 .protocol = IPPROTO_SCTP,
923 .prot = &sctpv6_prot,
924 .ops = &inet6_seqpacket_ops,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700925 .no_check = 0,
926 .flags = SCTP_PROTOSW_FLAG
927};
928static struct inet_protosw sctpv6_stream_protosw = {
929 .type = SOCK_STREAM,
930 .protocol = IPPROTO_SCTP,
931 .prot = &sctpv6_prot,
932 .ops = &inet6_seqpacket_ops,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700933 .no_check = 0,
934 .flags = SCTP_PROTOSW_FLAG,
935};
936
Herbert Xue5bbef22007-10-15 12:50:28 -0700937static int sctp6_rcv(struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700938{
Herbert Xue5bbef22007-10-15 12:50:28 -0700939 return sctp_rcv(skb) ? -1 : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700940}
941
Alexey Dobriyan41135cc2009-09-14 12:22:28 +0000942static const struct inet6_protocol sctpv6_protocol = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700943 .handler = sctp6_rcv,
944 .err_handler = sctp_v6_err,
945 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
946};
947
Neil Horman15efbe72008-02-15 09:53:59 -0500948static struct sctp_af sctp_af_inet6 = {
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800949 .sa_family = AF_INET6,
950 .sctp_xmit = sctp_v6_xmit,
951 .setsockopt = ipv6_setsockopt,
952 .getsockopt = ipv6_getsockopt,
953 .get_dst = sctp_v6_get_dst,
954 .get_saddr = sctp_v6_get_saddr,
955 .copy_addrlist = sctp_v6_copy_addrlist,
956 .from_skb = sctp_v6_from_skb,
957 .from_sk = sctp_v6_from_sk,
958 .to_sk_saddr = sctp_v6_to_sk_saddr,
959 .to_sk_daddr = sctp_v6_to_sk_daddr,
960 .from_addr_param = sctp_v6_from_addr_param,
961 .to_addr_param = sctp_v6_to_addr_param,
962 .dst_saddr = sctp_v6_dst_saddr,
963 .cmp_addr = sctp_v6_cmp_addr,
964 .scope = sctp_v6_scope,
965 .addr_valid = sctp_v6_addr_valid,
966 .inaddr_any = sctp_v6_inaddr_any,
967 .is_any = sctp_v6_is_any,
968 .available = sctp_v6_available,
969 .skb_iif = sctp_v6_skb_iif,
970 .is_ce = sctp_v6_is_ce,
971 .seq_dump_addr = sctp_v6_seq_dump_addr,
Vlad Yasevichb9031d92008-06-04 12:40:15 -0700972 .ecn_capable = sctp_v6_ecn_capable,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800973 .net_header_len = sizeof(struct ipv6hdr),
974 .sockaddr_len = sizeof(struct sockaddr_in6),
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800975#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800976 .compat_setsockopt = compat_ipv6_setsockopt,
977 .compat_getsockopt = compat_ipv6_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800978#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700979};
980
Neil Horman15efbe72008-02-15 09:53:59 -0500981static struct sctp_pf sctp_pf_inet6 = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700982 .event_msgname = sctp_inet6_event_msgname,
983 .skb_msgname = sctp_inet6_skb_msgname,
984 .af_supported = sctp_inet6_af_supported,
985 .cmp_addr = sctp_inet6_cmp_addr,
986 .bind_verify = sctp_inet6_bind_verify,
987 .send_verify = sctp_inet6_send_verify,
988 .supported_addrs = sctp_inet6_supported_addrs,
989 .create_accept_sk = sctp_v6_create_accept_sk,
990 .addr_v4map = sctp_v6_addr_v4map,
Neil Horman15efbe72008-02-15 09:53:59 -0500991 .af = &sctp_af_inet6,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700992};
993
Sridhar Samudrala827bf122007-05-04 13:36:30 -0700994/* Initialize IPv6 support and register with socket layer. */
Vlad Yasevich270637a2008-03-20 15:17:14 -0700995void sctp_v6_pf_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700996{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700997 /* Register the SCTP specific PF_INET6 functions. */
Neil Horman15efbe72008-02-15 09:53:59 -0500998 sctp_register_pf(&sctp_pf_inet6, PF_INET6);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700999
1000 /* Register the SCTP specific AF_INET6 functions. */
Neil Horman15efbe72008-02-15 09:53:59 -05001001 sctp_register_af(&sctp_af_inet6);
Vlad Yasevich270637a2008-03-20 15:17:14 -07001002}
1003
1004void sctp_v6_pf_exit(void)
1005{
1006 list_del(&sctp_af_inet6.list);
1007}
1008
1009/* Initialize IPv6 support and register with socket layer. */
1010int sctp_v6_protosw_init(void)
1011{
1012 int rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001013
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001014 rc = proto_register(&sctpv6_prot, 1);
1015 if (rc)
1016 return rc;
1017
1018 /* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */
1019 inet6_register_protosw(&sctpv6_seqpacket_protosw);
1020 inet6_register_protosw(&sctpv6_stream_protosw);
1021
1022 return 0;
1023}
1024
Vlad Yasevich270637a2008-03-20 15:17:14 -07001025void sctp_v6_protosw_exit(void)
1026{
1027 inet6_unregister_protosw(&sctpv6_seqpacket_protosw);
1028 inet6_unregister_protosw(&sctpv6_stream_protosw);
1029 proto_unregister(&sctpv6_prot);
1030}
1031
1032
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001033/* Register with inet6 layer. */
1034int sctp_v6_add_protocol(void)
1035{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001036 /* Register notifier for inet6 address additions/deletions. */
1037 register_inet6addr_notifier(&sctp_inet6addr_notifier);
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001038
1039 if (inet6_add_protocol(&sctpv6_protocol, IPPROTO_SCTP) < 0)
1040 return -EAGAIN;
1041
1042 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001043}
1044
Sridhar Samudrala827bf122007-05-04 13:36:30 -07001045/* Unregister with inet6 layer. */
1046void sctp_v6_del_protocol(void)
1047{
1048 inet6_del_protocol(&sctpv6_protocol, IPPROTO_SCTP);
1049 unregister_inet6addr_notifier(&sctp_inet6addr_notifier);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001050}